Variable Cylinder Ratio Control Reducing Engine Speed Fluctuation
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Solution Overview
Problem
Conventional variable combustion cylinder ratio control devices experience significant engine speed fluctuations due to changes in cylinder deactivation intervals, complicating torque management and reducing responsiveness when adjusting combustion cylinder ratios.
Innovation Solution
A variable combustion cylinder ratio control device that sets a target ratio achievable by repeating cylinder deactivation at regular intervals, with a pattern determining section adjusting the cylinder deactivation interval by a variable value (X) based on engine operating states to minimize engine speed fluctuations while maintaining responsiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the cylinder deactivation interval is changed to adjust combustion cylinder ratio, then the combustion cylinder ratio can be variably controlled, but engine speed fluctuation increases
Solution Approach 1:
The patent applies dynamics by making the cylinder deactivation interval adjustable and variable based on operating conditions. The control device dynamically changes the deactivation interval to achieve different combustion cylinder ratios while adapting to maintain engine speed stability through feedback control mechanisms.
Solution Approach 2:
The patent changes the parameter of cylinder deactivation interval to control combustion cylinder ratio. By varying this parameter, the system achieves different combustion ratios while managing engine speed fluctuations through coordinated control of the deactivation timing and duration.
2Stability of the object's composition
If torque management is executed for each cylinder to reduce engine speed fluctuation, then engine speed stability improves, but control complexity increases
Solution Approach 1:
The patent merges the control functions by integrating cylinder-specific torque management with overall engine control. The control device combines individual cylinder torque control with global combustion ratio management, reducing the need for separate complex control systems for each cylinder while maintaining engine speed stability.
Solution Approach 2:
The control device is designed with multi-functionality, handling both individual cylinder torque management and overall combustion ratio control through a unified system. This universal approach reduces control complexity by eliminating the need for separate dedicated control mechanisms for each function.
3Productivity
If the cylinder deactivation pattern is changed to achieve different combustion cylinder ratios, then combustion efficiency improves, but torque management complexity increases
Solution Approach 1:
The patent applies dynamics by making the cylinder deactivation pattern adaptable to different operating conditions. The control device dynamically adjusts the deactivation pattern to achieve optimal combustion efficiency while managing torque variations through coordinated control, reducing the complexity of torque management compared to static patterns.
Solution Approach 2:
The patent changes the parameters of cylinder deactivation pattern to control combustion cylinder ratio and optimize combustion efficiency. By varying these parameters in a coordinated manner, the system achieves different combustion ratios while managing torque management complexity through integrated control strategies.
Data Source
AI summary
A variable combustion cylinder ratio control device includes a target ratio setting section and a pattern determining section. The pattern determining section determines a target deactivation interval as a subsequent deactivation interval when the difference between a current deactivation interval and the target deactivation interval is less than or equal to X cylinders, and determines, as the subsequent deactivation interval, an interval closer to the target deactivation interval than the current deactivation interval by X cylinders when the difference between the current deactivation interval and the target deactivation interval exceeds X cylinders. The value of X is a natural number and a variable value that varies in accordance with the operating state of the engine.